Abstract: An improved operator's station includes an improved three position seat assembly which allows the operator to stand, perch or sit while maintaining the operator's eyes at essentially the same vertical level. The seat assembly includes a back rest, a seat that may be raised and lowered, and a movable shelf or perch positioned between the back rest and the seat. In a stand mode of operation, the seat is lowered and the shelf is raised; in a perch mode of operation, the shelf is lowered to provide a partial support for the weight of the operator; and, in a sit mode of operation, the seat is raised for substantially full support of the weight of the operator and the shelf is raised to be flush with the back rest. Two sets of foot pedals are provided in the improved operator's station. A first set of pedals is on the floor and includes a brake pedal and a power pedal. These pedals are operated when the operator is either standing or perching.